fn fibonacci(number: i32) -> i32 {
    if number < 2 {
        return number;
    } else {
        return fibonacci(number - 1) + fibonacci(number - 2);
    }
}
fn main() {
    println!("{:?}", fibonacci(3));
    println!("{:?}", fibonacci(15));
    println!("{:?}", fibonacci(30));
}
